b7cd2c11f7
Test what qemu-img check says about an image after one has written compressed data to an offset above 4 GB. Signed-off-by: Max Reitz <mreitz@redhat.com> Message-id: 20191028161841.1198-3-mreitz@redhat.com Reviewed-by: Alberto Garcia <berto@igalia.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
80 lines
2.4 KiB
Bash
Executable File
80 lines
2.4 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Test compressed write to a qcow2 image at an offset above 4 GB
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#
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# Copyright (C) 2019 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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seq=$(basename "$0")
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echo "QA output created by $seq"
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status=1 # failure is the default!
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_cleanup()
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{
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_cleanup_test_img
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}
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trap "_cleanup; exit \$status" 0 1 2 3 15
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# get standard environment, filters and checks
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. ./common.rc
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. ./common.filter
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# This is a qcow2 regression test
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_supported_fmt qcow2
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_supported_proto file
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# External data files do not support compression;
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# We need an exact cluster size (2M) and refcount width (2) so we can
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# get this test quickly over with; and this in turn require
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# compat=1.1
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_unsupported_imgopts data_file cluster_size refcount_bits 'compat=0.10'
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# The idea is: Create an empty file, mark the first 4 GB as used, then
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# do a compressed write that thus must be put beyond 4 GB.
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# (This used to fail because the compressed sector mask was just a
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# 32 bit mask, so qemu-img check will count a cluster before 4 GB as
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# referenced twice.)
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# We would like to use refcount_bits=1 here, but then qemu-img check
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# will throw an error when trying to count a cluster as referenced
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# twice.
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_make_test_img -o cluster_size=2M,refcount_bits=2 64M
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reft_offs=$(peek_file_be "$TEST_IMG" 48 8)
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refb_offs=$(peek_file_be "$TEST_IMG" $reft_offs 8)
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# We want to cover 4 GB, those are 2048 clusters, equivalent to
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# 4096 bit = 512 B.
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truncate -s 4G "$TEST_IMG"
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for ((in_refb_offs = 0; in_refb_offs < 512; in_refb_offs += 8)); do
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poke_file "$TEST_IMG" $((refb_offs + in_refb_offs)) \
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'\x55\x55\x55\x55\x55\x55\x55\x55'
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done
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$QEMU_IO -c 'write -c -P 42 0 2M' "$TEST_IMG" | _filter_qemu_io
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echo
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echo '--- Check ---'
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# This should only print the leaked clusters in the first 4 GB
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_check_test_img | grep -v '^Leaked cluster '
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# success, all done
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echo "*** done"
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rm -f $seq.full
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status=0
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